Malicious PDF — malware analysis report

Static analysis result for SHA-256 879b31e24b8861de…

MALICIOUS

PDF

88.0 KB Created: 2021-07-29 22:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fd849313485d562f69fb2b3f4e899b90 SHA-1: 9141eb963a3fce3ac31160f23a863f108e80afe4 SHA-256: 879b31e24b8861de7aa5674fd214c9727c8e61b5d9026ca52c49460384e920aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e8f9b07e---fomonivugemuwakogujav.pdf In PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/rumajikakilixux.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b6e9a92eda7147ed70cf5e39bb4b0d7e/tademugasilexafeb.pdfIn PDF document text
    • http://fxmeat.com/upload/file/82b265e96d1d8eacc77e8f231c099be9.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/vifavivewegakoji.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4c7b4dce---luzesilezelimofob.pdfIn PDF document text
    • https://petek.biz/resimler/files/piwewimulupazuxuzipuleg.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/05d587e7d5f73275722867155d772538/43810741602.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/76393635712.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/5035410840.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u5c450gpvh7urtpttegas8sn7g/47026037361.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/k368t667dd66frma59s9ofd5n0/49164141071.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/20296396306.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ud0fidsooc8b6dkoqettqal0t3/36315031350.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/b8f782722a1fe1eeb0488e0ef4d8f331/93158543941.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0agsngtnnu7m494b60e3j5e522/94166208087.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/gobinuzo.pdfIn PDF document text
    • http://tianfonmm.com/d/files/vizedojirewatixono.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/79241572554.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/wevigog.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/132021aa14aeb4539e026672b002bc83/87682813419.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/41523466885.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/tamapu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095475142124---91372543428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+sell+your+house+if+it+has+a+lien+on+itPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 10556 bytes
SHA-256: 8b5054ad72496d22aced8bbfccfd0cf56654d9c781c5d6cabc3edbdadabd351a
font_01_sfnt_off00010f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 16292 bytes
SHA-256: d4b403e854a5796b3cb8bdc9096cdcd6c21b607daecb40ac6966189612ae89c8
font_02_sfnt_off0001398f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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